Salix reticulata |
Salix fuscescens |
|
---|---|---|
net-leaf willow, net-vein willow, netted willow |
Alaska bog willow |
|
Habit | Plants 0.03–0.15 m, (dwarf, forming clones by layering). | Plants 0.15–0.55 m, forming clones by layering. |
Stems | trailing; branches and branchlets yellow-brown or red-brown, glabrous. |
decumbent or trailing; branches yellow-brown, glabrous; branchlets red-brown, gray-brown, or yellow-brown, glabrous. |
Leaves | stipules absent or rudimentary; petiole 3–46 mm, (sometimes glandular distally); largest medial blade amphistomatous or hemiamphistomatous, (2 pairs of secondary veins arising at or close to base, arcing toward apex), oblong, broadly oblong, broadly elliptic, subcircular, or circular, (8–)12–66 × 8–50 mm, 1–1.5 times as long as wide, base convex, rounded, subcordate, or cordate, margins slightly revolute, entire or crenulate (glandular-dotted), apex rounded, convex, or retuse, abaxial surface sparsely long-silky to glabrescent, adaxial (venation deeply impressed), slightly or highly glossy, glabrous or pilose; proximal blade margins entire; juvenile blade glabrous. |
stipules absent or rudimentary; petiole 2–5.6(–6.4) mm; largest medial blade hypostomatous, narrowly oblong, oblong, obovate, or broadly obovate, (14–)17–27(–45) × 7–21 mm, 1.4–2.5 times as long as wide, base cuneate or convex, margins slightly revolute or flat, entire, or serrulate to crenate proximally, (glands marginal), apex convex, acuminate, or rounded, abaxial surface glaucous, glabrous, adaxial slightly or highly glossy, glabrous; proximal blade margins entire, (sometimes hairs ferruginous abaxially); juvenile blade glabrous. |
Staminate flowers | abaxial nectary 0.5–0.9 mm, adaxial nectary oblong or ovate, 0.5–1 mm, nectaries connate and cup-shaped; filaments distinct, hairy on proximal 1/2 or throughout; anthers ellipsoid or globose, 0.3–0.4 mm. |
abaxial nectary absent, adaxial nectary oblong, 0.5–0.8 mm; filaments distinct or connate less than 1/2 their lengths, glabrous; anthers ellipsoid or shortly cylindrical, 0.3–0.4 mm. |
Pistillate flowers | abaxial nectary (0–)0.3–0.5 mm, adaxial nectary narrowly oblong, 0.5–1 mm, equal to or longer than stipe, nectaries distinct or connate and cup-shaped; stipe 0–0.8 mm; ovary pyriform or ovoid, short-silky, hairs flattened, beak abruptly tapering to styles; ovules 8–18 per ovary; styles connate to distinct 1/2 their lengths, 0.2–0.3 mm; stigmas flat, abaxially non-papillate with rounded tip, broadly cylindrical, or 2 plump lobes, 0.2–0.26–0.36 mm. |
abaxial nectary absent, adaxial nectary oblong, 0.4–0.9 mm, shorter than stipe; stipe 0.8–2.5 mm; ovary obclavate, pubescent or short-silky to glabrescent, hairs (often ferruginous), flattened or ribbonlike, beak abruptly tapering to styles; ovules 8–12 per ovary; styles connate or distinct distally, 0.1–0.4(–0.65) mm; stigmas slenderly or broadly cylindrical, 0.24–0.3–0.68 mm. |
Capsules | 4.5–5 mm. |
5.5–8 mm. |
Catkins | staminate 11–54 × 4–9 mm, flowering branchlet 2–28 mm; pistillate densely flowered (more than 6 flowers), slender or stout, 11–79 × 3–8 mm, flowering branchlet 2–37 mm; floral bract tawny, 0.8–1.8 mm, apex rounded to retuse, entire, abaxially glabrous. |
staminate 8–58 × 5–19 mm, flowering branchlet 0.5–15 mm; pistillate moderately densely to loosely flowered, slender, stout, or subglobose, 13.5–64(–70 in fruit) × 6.5–15 mm, flowering branchlet 4–18 mm; floral bract brown or bicolor, 0.8–1.6 mm, apex rounded, entire, abaxially sparsely hairy, hairs (usually white, sometimes also ferruginous), wavy or straight. |
2n | = 38. |
= 38. |
Salix reticulata |
Salix fuscescens |
|
Phenology | Flowering early Jun-mid Aug. | Flowering Jun-late Jul. |
Habitat | Arctic-alpine, polygonal tundra, dry tussock tundra, partially stabilized sand dunes, sedge meadows, Dryas tundra on alpine cliffs and ledges, snowbeds, stabilized talus slopes, white spruce woods, treed bogs | Bogs, treed bogs, sedge fens, poorly drained lakeshores, wet tundra, silt or fine sandy-gravel substrates |
Elevation | 0-3500 m (0-11500 ft) | 50-1000 m (200-3300 ft) |
Distribution |
AK; CO; AB; BC; MB; NL; NT; NU; ON; QC; SK; YT; Europe; Asia (Chukotka, Russian Far East, arctic, e Siberia, Spitzbergen)
|
AK; MB; NT; NU; YT; e Asia (Chukotka, Japan [Hokkaido], North Korea, Russian Far East, arctic, e Siberia) |
Discussion | The reported occurrence of Salix reticulata in Colorado (R. D. Dorn 1997) needs further study. Salix reticulata occurs in Europe in northern Scotland, northern Scandinavia, the Alps and other European mountains, and arctic Eurasia. The species is circumpolar except for Greenland and Iceland. A population of Salix reticulata on the Queen Charlotte Islands, with consistently glabrous ovaries, was named subsp. glabellicarpa. Some southeastern Alaska populations have plants with glabrous, partially hairy, and completely short-silky ovaries growing together. The possibility that subsp. glabellicarpa may be a hybrid or a simple mutation needs study. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Hybrids: Salix fuscescens forms natural hybrids on the arctic coast of Alaska with S. arctica, S. ovalifolia, and S. phlebophylla, and in continental Nunavut with S. herbacea. These hybrids are not usually recognized but they appear sporadically. Salix fuscescens × S. herbacea has crenate margins and is often confused with the latter species. Some specimens identified as Salix fuscescens × S. ovalifolia are similar to hybrids with S. phlebophylla, but they lack marcescent leaves. Salix fuscescens × S. phlebophylla has obovate leaves with one or two pairs of serrulations proximally, and glaucous abaxially as in S. fuscescens, but it grows in relatively dry tundra and has the marcescent, sometimes skeletonized, leaves of S. phlebophylla. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 65. | FNA vol. 7, p. 72. |
Parent taxa | Salicaceae > Salix > subg. Chamaetia > sect. Chamaetia | Salicaceae > Salix > subg. Chamaetia > sect. Myrtosalix |
Sibling taxa | ||
Synonyms | S. reticulata var. gigantifolia, S. reticulata subsp. glabellicarpa, S. reticulata var. semicalva | S. fuscescens var. reducta |
Name authority | Linnaeus: Sp. Pl. 2: 1018. (1753) | Andersson: Monogr. Salicum, 97. (1867) |
Web links |